Graduate Thesis Or Dissertation

 

Limiting copper loss from treated wood in or near aquatic environments Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qz20sv42h

Descriptions

Attribute NameValues
Creator
Abstract
  • Copper migration from treated wood has created concerns within the environmental community because of the potential effects of this heavy metal on aquatic organisms. Migration can be limited, to some extent, by more controlled treatments and by post-treatment processing, but these actions cannot completely overcome the problem. An alternative approach to limit copper migration is to incorporate additives into the formulations that would either block or slow copper loss. Preliminary trials suggest that adding small amounts of Di(hydrogenated tallowalkyl)dimethyl ammonium chloride (2HT), a common fabric softener, to the treating solution can reduce copper losses in service. Reducing copper losses may also allow the use of lower initial preservative loadings. In this research, the potential for using 2HT was examined to reduce copper losses while maintaining preservative efficacy. The effect of the additive on leaching was assessed by soaking blocks in water over a 14-day period, then examining the resulting leachate. The incorporation of 2HT to alkaline copper-based and DDAC preservative solutions reduced the rate of copper migration from southern pine blocks subjected to laboratory leaching procedures by 5% to 14%. 2HT had no effect on loss rates for isothiazolone. Biological efficacy was assessed by exposing treated blocks to decay fungi in a soil block test. 2HT did not enhance the biological efficacy of copper azole nor isothiazolone in standard laboratory trials with a brown rot fungus, P. placenta. The potential for chemical interactions was assessed using Fourier Transform Infrared Spectroscopy (FTIR) analysis. Results indicated that 2HT did not change the structure of wood, suggesting that 2HT reduces copper losses due to ionic interactions between the organic cationic end of the quaternary ammonium compound and the negatively charged surface of wood. This interaction leaves the hydrophobic end of the 2HT exposed to act as a water repellent, thereby excluding the water that would otherwise solubilize and remove copper from the wood. Results provide support for using this additive to limit copper losses into the environment.
License
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Peer Reviewed
Language
File Format
File Extent
  • 3052250 bytes
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2007-08-27T19:35:27Z (GMT) No. of bitstreams: 1 Thesis Final Jul30.pdf: 3052250 bytes, checksum: 84d0c0d43b178813477e8f603fa80da6 (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2007-08-24T16:28:02Z (GMT) No. of bitstreams: 1 Thesis Final Jul30.pdf: 3052250 bytes, checksum: 84d0c0d43b178813477e8f603fa80da6 (MD5)
  • description.provenance : Submitted by June Mitsuhashi Gonzalez (mitsuhaj@onid.orst.edu) on 2007-08-23T18:17:30Z No. of bitstreams: 1 Thesis Final Jul30.pdf: 3052250 bytes, checksum: 84d0c0d43b178813477e8f603fa80da6 (MD5)
  • description.provenance : Made available in DSpace on 2007-08-27T19:35:28Z (GMT). No. of bitstreams: 1 Thesis Final Jul30.pdf: 3052250 bytes, checksum: 84d0c0d43b178813477e8f603fa80da6 (MD5)

Relationships

Parents:

This work has no parents.

In Collection:

Items